Answer:
20
Step-by-step explanation:
x-intercept(s):
(
7
,
0
)
, (-1,0)
y-intercept(s):
(0,-7)
Step-by-step explanation:
It c) because it 56 out of 100
Answer:
well obvesly there is no answer
Step-by-step explanation:
For this case we have an equation of the form:
y = A * (b) ^ t
Where,
A: initial amount
b: decrease rate
t: time in years.
Substituting values we have:
7 = A * (0.5) ^ ((1/20) * t)
For t = 45 years we have:
7 = A * (0.5) ^ ((1/20) * 45)
Clearing A:
A = 7 / ((0.5) ^ ((1/20) * 45))
A = 33.3
Answer:
the density of the substance when it was deposited 45 years ago was:
A = 33.3 milligrams per square centimeter